ML20094H816
| ML20094H816 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/10/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-4-120, NUDOCS 8408140127 | |
| Download: ML20094H816 (3) | |
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Duquestie Lkjit gggi20 (412) 923-1960 Nuclear Construction Division Telecopy (412) 787-2629 Robinson Plaza, Building 2, Suite 210 Pittsburgh, PA 15205 August 10, 1984 United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Mr. George W. Knighton, Chief Licensing Branch 3 Of fice of Nuclear Reactor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Materials Engineering Branch Open Items Gentlemen:
This letter fo rward s res ponses to draft SER Open Item 156 and Confirmatory Item 22 provided by the Material Engineering Branch (MTEB).
This draf t SER material was of ficially transmitted from the NRC to Duquesne Light Company (DLC) on May 30, 1984.
Informal res ponse to these open items were transmitted to you on August 6, 1984.
Res ponses to MTEB Open Items 49, 50, and 51, which were t ransmitted from the NRC to DLC on March 1,1984, were submitted on April 30, 1984, by letter 2NRC-4-049.
MrEB Open Items 48 and 54, which were also included in the March 1, 1984, NRC transmittal, are addressed by the PSI program submitted via letter 2NRC-4-096, dated June 29, 1984.
The attached responses and above-referenced submittals address all of the MTEB draf t SER items.
DUQUESNE LIGHT COMPANY By 9i E. Vf. 'Woolever Vice President JJS/wjs Attachment cc:
Ms. M. Ley, Project Manager (w/a)
Mr. E. A. Licitra, Project Manager (w/a)
Mr. G. Walton, NRC Resident Inspector (w/a)
J1 RIBED AND t g4 blic A
ELVA G. LESONDAK, NOTARY PUBLIC l
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ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986 k
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6 Urfitsd Stets Nuclect R2gulatory Connaission Mr. George W. Knighton, Chief Page 2 COMMONWEALT'l OF PENNSYLVANIA )
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On this Notary Public in and for said Commo(wealth and County, personally appeared E. J. Woolever, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set fo rth in the Submittal are true and correct to the best of his knowledge.
2 bsd 4h Jiotary Public ELVA G. LESONDAK, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
C1 22
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THE APPLICANT HAS NOT ADDRESSED THE STAFF POSITION ON LIMITING RCPB COMPONENTS CONSTRUCTED OF AUSTENTIC STAINLESS STEEL TO A MAXIMUM YIELD STRENGTH OF 90,000 PSI.
RESPONSE
THE AUSTENTIC STAINLESS STEELS USED IN THE CONSTRUCTION OF THE RCPB COMPONENTS ARE USED IN THE ANNEALED CONDITION AND THEREFORE DO NOT HAVE A YIELD STRENGTH GREATER THAN 90,000 PSI.
OI 156 THE CONTROLS IMPOSED DURING WELD CLADDING OF FERRITIC STEEL COMPONENTS ARE NOT IN CONFORMANCE WITH THE RECOMMENDATIONS OF REG. GUIDE 1.43, " CONTROL OF STAIN-LESS STEEL WELD CLADDING OF LOW-ALLOY STEEL COMPONENTS." THE APPLICANT MUST PROVIDE ASSURANCE THAT UNDERCLAD CRACKING DID NOT OCCUR DURING THE WELD CLADDING OF ASME SA-508 CLASS 2 FORGINGS.
RESPONSE
-THE REACTOR VESSEL MANUFACTURER PERFORMS A SPECIAL PROCEDURE QUALIFICATION CON-SISTENT WITH REG. GUIDE 1.43 AS DESCRIBED IN REG. GUIDE 1,43 REG. GUIDE POSITION C.2 WHEN "HIGli HEAT INPUT" CLADDING PROCEDURES ARE USED.
"HIGH-HEAT-INPUT" WELDING PROCESSES THAT INDUCE UNDERCLAD CRACKING, SUCH AS SINGLE LAYER SUBHERGED WIDE STRIP WELDING PROCESS AND THE SUBMERGED ARC 6-WIRE PROCESS, WERE NOT USED TO CLAD THE ASME SA508 CLASS 2 FORGINGS (REACTOR VESSEL PARTS WHICH INCLUDE REACTOR VESSEL N0ZZLES, VESSEL FLANGE, AND HEAD FLANGE).
MULTIPLE LAYER CLADDING WAS APPLIED FOR THESE VESSEL PARTS MADE FROM SA508 CLASS 2 FORGINGS *, MULTI-LAYER CLADDING RESULTS IN A FINE CRAIN HEAT AFFECTED ZONE IN THE SA508 CLASS 2 BASE METAL.
STAINLESS STEEL WELD CLADDING OF LOW-ALLOY STEEL IS NOT USED FOR OTHER NSSS COMPONENTS OR BALANCE-OF-PLANT (DMPONENTS.
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